Win32 Text Output Example

[OHGxLeetGamerxOHG]

Note: I am not asking for any help, I am just posting an example for those who want to learn this.

// How to print text in Win32 C/C++
// Auther: -LeetGamer-

#include <Windows.h>

HINSTANCE hInstance;

// Function I made to get the size of the text
int GetTextSize (LPSTR a0)
{
    for (int iLoopCounter = 0; ;iLoopCounter++)
    {
        if (a0 [iLoopCounter] == '\0')
            return iLoopCounter;
    }
}

LPSTR TextArray [] = {
    "Hello World"
};

LRESULT CALLBACK WndProc (HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    switch (msg)
    {
        case WM_CLOSE:
        DestroyWindow (hwnd);
        break;

        case WM_DESTROY:
        PostQuitMessage (0);
        break;
        
        case WM_PAINT:
        {
            PAINTSTRUCT ps;
            HDC hdc = BeginPaint (hwnd, &ps);
            TextOut (hdc,
                     // Location of the text
                     10,
                     10,
                     // Text to print
                     TextArray [0],
                     // Size of the text, my function gets this for us
                     GetTextSize (TextArray [0]));
            EndPaint (hwnd, &ps);
        }
        break;
    }
    return DefWindowProc (hwnd, msg, wParam, lParam);
}

int WINAPI WinMain (HINSTANCE hInstanace, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
    WNDCLASSEX WindowClass;
    WindowClass.cbClsExtra = 0;
    WindowClass.cbWndExtra = 0;
    WindowClass.cbSize = sizeof (WNDCLASSEX);
    WindowClass.lpszClassName = "1";
    WindowClass.lpszMenuName = NULL;
    WindowClass.lpfnWndProc = WndProc;
    WindowClass.hIcon = LoadIcon (NULL, IDI_APPLICATION);
    WindowClass.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
    WindowClass.hCursor = LoadCursor (NULL, IDC_ARROW);
    WindowClass.style = 0;
    WindowClass.hbrBackground = (HBRUSH) (COLOR_WINDOW + 1);
    RegisterClassEx (&WindowClass);

    HWND hwnd = CreateWindowEx (WS_EX_CLIENTEDGE,
                                "1",
                                "Printing Text in Win32 C/C++",
                                WS_OVERLAPPEDWINDOW,
                                315, 115,
                                640, 480,
                                NULL,
                                NULL,
                                hInstance,
                                NULL);

    ShowWindow (hwnd, SW_SHOWNORMAL);

    MSG msg;

    while (GetMessage (&msg, NULL, 0, 0) > 0)
    {
        TranslateMessage (&msg);
        DispatchMessage (&msg);
        if (VK_ESCAPE == msg.wParam)
            break;
    }
    return 0;
}

If you have any questions let me know.

[Kiana]

#1 - Why not use strlen?
#2 - Why have an array of strings when you're outputting one?
#3 - static and const are awesome keywords.
#4 - You should be handling the escape key within WinProc, not in your GetMessage loop.

[OHGxLeetGamerxOHG]

1) Never heard of it :P edit: nvm lol I know that, but I learned it a long time ago and never thought to use it, plus I like making my own functions if I can
2) Because I usually have a lot of strings that I put in an array so I just used an array, but in this case I only had one
3) ok....
4) I have been doing that for a wile because of when people are editing some window text and they press esc it doesn't close so I just put it there, there really isn't a difference anyway...

[freddie1]

4) I have been doing that for a wile because of when people are editing some window text and they press esc it doesn't close so I just put it there, there really isn't a difference anyway...

Its wrong.

[OHGxLeetGamerxOHG]

What do you mean "Its wrong." ? =/

[freddie1]

If you have a program with multiple Windows you will have problems. The message loop services all messages for all windows in your primary thread. If you have a program that opens a main program window, which then - due perhaps to some user activity - opens another window, hitting the escape key will not only close the 2nd window, but rather the whole program. I don't use switch constructs to map my message handlers to windows messages, but here is what you should have....

#include <windows.h>

LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
 switch(message)
 {
   case WM_CHAR:
     {
        if(wParam==VK_ESCAPE)
           SendMessage(hwnd,WM_CLOSE,0,0);
        return 0;
     }
   case WM_PAINT:
     {
        PAINTSTRUCT ps;
        HDC hDC;
        char szBuffer[]="Hello, World!";
        hDC=BeginPaint(hwnd,&ps);
        TextOut(hDC,10,10,szBuffer,strlen(szBuffer));
        EndPaint(hwnd,&ps);
        return 0;
     }
   case WM_DESTROY:
     {
        PostQuitMessage(0);
        return 0;
     }
 }

 return DefWindowProc (hwnd, message, wParam, lParam);
}


int WINAPI WinMain(HINSTANCE hIns, HINSTANCE hPrev, LPSTR lpszArgument, int nCmdShow)
{
 char szClassName[]="Form6";
 WNDCLASSEX wc;
 MSG messages;
 HWND hwnd;

 wc.hInstance=hIns;
 wc.lpszClassName=szClassName,                         wc.lpfnWndProc = WndProc;
 wc.style = CS_DBLCLKS,                                wc.cbSize = sizeof (WNDCLASSEX);
 wc.hIcon = LoadIcon (NULL, IDI_APPLICATION),          wc.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
 wc.hCursor = LoadCursor (NULL, IDC_ARROW),            wc.lpszMenuName = NULL;
 wc.cbClsExtra = 0,                                    wc.cbWndExtra = 0;
 wc.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
 RegisterClassEx(&wc);
 hwnd=CreateWindow(szClassName,szClassName,WS_OVERLAPPEDWINDOW,200,200,444,375,HWND_DESKTOP,NULL,hIns,NULL);
 ShowWindow(hwnd, nCmdShow);
 while(GetMessage(&messages, NULL, 0, 0))
 {
    TranslateMessage(&messages);
    DispatchMessage(&messages);
 }

 return messages.wParam;
}

[kaije]

Heres an example of how to draw text in the center of your window, and set the font/colour/transparent background

	RECT rc;
	GetClientRect(hwnd, &rc);

	SelectObject(hdc, GetStockObject(DEFAULT_GUI_FONT));
	SetBkMode(hdc, TRANSPARENT);
	SetTextColor(hdc, RGB(255, 0, 0));

	std::string strOut = "Hello World!"; // or wstring if you have unicode set
	DrawText(hdc, strOut.c_str(), strOut.length(), &rc, DT_CENTER | DT_VCENTER | DT_SINGLELINE);

if you want your custom font then check out the CreateFont() api, but remember to use DeleteObject on the HFONT when you finish.